Re: [PATCH] fpga: altera-hps2fpga: add NULL check on of_match_device() return value

[Gustavo A. R. Silva]

Hi Alan,

Quoting Alan Tull <atull@xxxxxxxxxx>:

> On Fri, Jul 7, 2017 at 1:22 AM, Gustavo A. R. Silva
>
> Hi Gustavo,
>
> Thanks for the fix!

Absolutely, glad to help. :)

> Alan
>
> <garsilva@xxxxxxxxxxxxxx> wrote:
> > Check return value from call to of_match_device()
> > in order to prevent a NULL pointer dereference.
> >
> > In case of NULL print error message and return -ENODEV
> >
> > Signed-off-by: Gustavo A. R. Silva <garsilva@xxxxxxxxxxxxxx>
>
> Acked-by: Alan Tull <atull@xxxxxxxxxx>
>
> > ---
> >  drivers/fpga/altera-hps2fpga.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> >
> > diff --git a/drivers/fpga/altera-hps2fpga.c b/drivers/fpga/altera-hps2fpga.c
> > index 3066b80..ca8212c 100644
> > --- a/drivers/fpga/altera-hps2fpga.c
> > +++ b/drivers/fpga/altera-hps2fpga.c
> > @@ -143,6 +143,11 @@ static int alt_fpga_bridge_probe(struct  
> > platform_device *pdev)
> >         int ret;
> >
> >         of_id = of_match_device(altera_fpga_of_match, dev);
> > +       if (!of_id) {
> > +               dev_err(dev, "failed to match device\n");
> > +               return -ENODEV;
> > +       }
> > +
> >         priv = (struct altera_hps2fpga_data *)of_id->data;
> >
> >         priv->bridge_reset = of_reset_control_get_by_index(dev->of_node, 0);
> > --
> > 2.5.0
--
Gustavo A. R. Silva